NEET2014BotanyCell Cycle and Cell DivisionActual
In the 'S' phase of the cell cycle:
Options
- AAmount of DNA doubles in each cell
- BAmount of DNA remains same in each cell
- CChromosome number is increased
- DAmount of DNA is reduced to half in each cell
Correct answer
A. Amount of DNA doubles in each cell
Step-by-step solution
S-phase/Synthetic phase (a) DNA replicates and its amount becomes double (2C → 4C). (b) Synthesis of histone proteins. (c) Euchromatin replicates earlier than heterochromatin. (d) Synthesis of NHC (non-histone chromosomal proteins). (e) Each chromosome has 2 chromatids. Amount of DNA doubles but the chromosome number remains constant.